Brass knuckle mug



FIG. 1 is a left side view of the brass knuckle mug showing my design;

FIG. 2 is a right side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is an upper perspective view thereof. 

I claim the ornamental design for a brass knuckle mug, as shown and described. 